This package defines the API for instrumenting a Java VM by transforming class files to add profiling support, code coverage testing, or other features.

The -javaagent command-line option to the Java interpreter provides a hook for running the premain( ) method of a Java instrumentation agent. An Instrumentation object passed to the premain( ) method provides an entry point into this package, and methods of Instrumentation allow loaded classes to be redefined and ClassFileTransformer objects to be registered for classes not yet loaded.

Interfaces

public interface ClassFileTransformer;
public interface Instrumentation;

Classes

public final class ClassDefinition;

Exceptions

public class IllegalClassFormatException extends Exception;
public class UnmodifiableClassException extends Exception;